gcc/testsuite/gcc.c-torture/execute/string-opt-10.c

   1 /* Copyright (C) 2000, 2003  Free Software Foundation.
   2
   3    Ensure all expected transformations of builtin strncat occur and
   4    perform correctly.
   5
   6    Written by Kaveh R. Ghazi, 11/27/2000.  */
   7
   8 extern void abort (void);
   9 typedef __SIZE_TYPE__ size_t;
  10 extern char *strncat (char *, const char *, size_t);
  11 extern char *strcpy (char *, const char *);
  12 extern int strcmp (const char *, const char *);
  13 int x = 123;
  14
  15 int main ()
  16 {
  17   const char *const s1 = "hello world";
  18   const char *const s2 = "";
  19   char dst[64], *d2;
  20
  21   strcpy (dst, s1);
  22   if (strncat (dst, "", 100) != dst || strcmp (dst, s1))
  23     abort();
  24   strcpy (dst, s1);
  25   if (strncat (dst, s2, 100) != dst || strcmp (dst, s1))
  26     abort();
  27   strcpy (dst, s1); d2 = dst;
  28   if (strncat (++d2, s2, 100) != dst+1 || d2 != dst+1 || strcmp (dst, s1))
  29     abort();
  30   strcpy (dst, s1); d2 = dst;
  31   if (strncat (++d2+5, s2, 100) != dst+6 || d2 != dst+1 || strcmp (dst, s1))
  32     abort();
  33   strcpy (dst, s1); d2 = dst;
  34   if (strncat (++d2+5, s1+11, 100) != dst+6 || d2 != dst+1 || strcmp (dst, s1))
  35     abort();
  36   strcpy (dst, s1); d2 = dst;
  37   if (strncat (++d2+5, s1, 0) != dst+6 || d2 != dst+1 || strcmp (dst, s1))
  38     abort();
  39   strcpy (dst, s1); d2 = dst;
  40   if (strncat (++d2+5, "", ++x) != dst+6 || d2 != dst+1 || x != 124
  41       || strcmp (dst, s1))
  42     abort();
  43
  44   strcpy (dst, s1);
  45   if (strncat (dst, "foo", 3) != dst || strcmp (dst, "hello worldfoo"))
  46     abort();
  47   strcpy (dst, s1);
  48   if (strncat (dst, "foo", 100) != dst || strcmp (dst, "hello worldfoo"))
  49     abort();
  50   strcpy (dst, s1);
  51   if (strncat (dst, s1, 100) != dst || strcmp (dst, "hello worldhello world"))
  52     abort();
  53   strcpy (dst, s1); d2 = dst;
  54   if (strncat (++d2, s1, 100) != dst+1 || d2 != dst+1
  55       || strcmp (dst, "hello worldhello world"))
  56     abort();
  57   strcpy (dst, s1); d2 = dst;
  58   if (strncat (++d2+5, s1, 100) != dst+6 || d2 != dst+1
  59       || strcmp (dst, "hello worldhello world"))
  60     abort();
  61   strcpy (dst, s1); d2 = dst;
  62   if (strncat (++d2+5, s1+5, 100) != dst+6 || d2 != dst+1
  63       || strcmp (dst, "hello world world"))
  64     abort();
  65
  66   /* Test at least one instance of the __builtin_ style.  We do this
  67      to ensure that it works and that the prototype is correct.  */
  68   strcpy (dst, s1);
  69   if (__builtin_strncat (dst, "", 100) != dst || strcmp (dst, s1))
  70     abort();
  71
  72   return 0;
  73 }
  74
  75 #ifdef __OPTIMIZE__
  76 /* When optimizing, all the above cases should be transformed into
  77    something else.  So any remaining calls to the original function
  78    should abort.  */
  79 __attribute__ ((noinline))
  80 static char *
  81 strncat (char *s1, const char *s2, size_t n)
  82 {
  83   abort();
  84 }
  85 #endif